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BREW-poetry-CVE-2026-41140 — Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

2026-09-30T11:11:06.511601+00:00

Affected: Homebrew: poetry

Poetry is a dependency manager for Python. Prior to 2.3.4, the extractall() function in src/poetry/utils/helpers.py:410-426 extracts sdist tarballs without path traversal protection on Python versions where tarfile.data_filter is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4. This vulnerability is fixed in 2.3.4.

CVE-2026-41140 — Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

2026-09-30T11:11:06.511701+00:00

Affected: python-poetry poetry, Red Hat Ansible Automation Platform 2.6, Red Hat Ansible Automation Platform 2, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, Red Hat Satellite 6

GHSA-73h3-mf4w-8647 — Poetry has Path Traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

2026-09-30T11:11:06.511780+00:00

Affected: PyPI: poetry

### Summary

The `extractall()` function in `src/poetry/utils/helpers.py:410-426` extracts sdist tarballs without path traversal protection on Python versions where `tarfile.data_filter` is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4.

### Impact

Arbitrary file write (path traversal) from untrusted sdist content.

**In practice, the impact is low** because an attacker who exploits this vulnerability can as well include arbitrary code in a `setup.py`, which will be executed when the sdist is built after tar extraction. In other words, a malicious sdist can write arbitrary files by design. However, since it is unexpected and not by design that the file write already happens during tar extraction, this is still considered a vulnerability.

On Python 3.11.2 (Debian Bookworm default, directly tested), a crafted sdist with `../../` tar member paths writes files outside the intended extraction directory. The traversal occurs during metadata resolution (`poetry add --lock`), before the build backend is run.

Affected Environments: - **Python 3.10.0 through 3.10.12** (inclusive): `tarfile.data_filter` absent or broken - **Python 3.11.0 through 3.11.4** (inclusive): `tarfile.data_filter` absent or broken - **Debian Bookworm**: Python 3.11.2 (default) - **Ubuntu 22.04 LTS**: Python 3.10.6 (default)

### Patches

Versions 2.3.4 and newer of Poetry ensure that paths are inside the target directory.

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